- updated to 1.7.0
- removed outdated harfbuzz patch (evas now needs recently released harfbuzz 0.9.0)
- librsvg-based loader has been replaced by esvg-based one; esvg is not released yet, so disabled it

- split xcb_api bcond from xcb (the latter is on by default, just controls xcb deps use)
- build software_8_x11 engine whenever xcb is allowed, but use XCB for gl_x11/software_x11
only if xcb_api is chosen
- tag gl_x11/software_x11 engines and -devel package with xapi version (xcb/xlib)